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Water Quality Monitoring Plan Climax Molybdenum Company Version R4 Permit No M-1977-493 6.0 MONITORING REQUIREMENTS ABOVE EAGLE PARK AND CLINTON RESERVOIRS In accordance with the Stipulations to AM-06 to the Climax Reclamation Permit, the WQMP was provided to the reservoir companies for review and comment prior to submission to DRMS for review and approval as TR-18. Climax met with representatives of the reservoir companies and exchanged comments and responses on several separate occasions before and after TR-18 was submitted to DRMS. As a result of these discussions, and as included in TR-18, this Section contains monitoring and reporting conditions specific to the monitoring sites above Eagle Park and Clinton Reservoirs in addition to those that would be required under DRMS rules. Also addressed in this Section are additional data evaluation and reporting procedures specific to the POC well established above Eagle Park Reservoir(EV-MW-004)and the surface water monitoring at the Eagle Park Reservoir Outlet (EPR Outlet) and the East Fork Eagle River (Al and BI). 6.1 Monitoring Locations As agreed to with the reservoir companies and DRMS, Climax investigated the geology and groundwater conditions in the area between the north abutment of 1 Dam and Eagle Park Reservoir. In August of 2011, Climax also conducted a hydrologic reconnaissance with representatives of the reservoir companies to identify new monitoring locations above both Eagle Park and Clinton Reservoirs. As a result of this reconnaissance, and in agreement with the reservoir companies, groundwater monitoring well (EVMW-2) and three spring sites (EVS-1, EVS-2 and EVS-3) were established. Well EVMW-2 is a bedrock well (no saturated alluvium encountered) and was constructed to monitor groundwater quality between the north abutment of 1 Dam and Eagle Park Reservoir. The EVS sites were established to monitor expressions of shallow groundwater above Eagle Park Reservoir. These monitoring locations provide water quality data to detect potential changes in groundwater quality that could potentially reach Eagle Park Reservoir. Also in accordance with the AM-06 Stipulations, two monitoring locations were selected above Clinton Reservoir and confirmed during the site reconnaissance with reservoir company representatives. The first location agreed to with the reservoir companies is a surface water monitoring site located in upper Clinton Creek (CC-SW1)above its confluence with Clinton Reservoir(Figure 5). The second location is a surface water monitoring site at the inlet to the East Interceptor culvert (EI-SW1) below the McNulty Overburden Storage Facility and upgradient of Clinton Reservoir (Figure 5). These locations were selected to detect water quality changes from surface runoff above Clinton Reservoir. As described in TR-18, Climax also established an additional POC monitoring site (EV-MW-004) above Eagle Park Reservoir, identified on Figure 3. In addition, Climax will conduct monitoring of water released from the Eagle Park Reservoir(EPR Outlet) in conjunction with surface water monitoring in the East Fork Eagle River, above and below the confluence with the reservoir outlet. In summary, and as discussed in Section 3, these sites include the following locations: ■ Groundwater monitoring well (EVMW-2) constructed between the north abutment of 1 Dam and Eagle Park Reservoir(Figure 3); ■ The shallow/deep pair of wells (EVMW-1 S and 1 D) below the Robinson Lake Seepage Collection Pond; ■ The POC well above Eagle Park Reservoir(EV-MW-004); EPP—Appendix C March 2018 29